Rewrite existing functionality in Rust

[rizsotto]

• This can be a good learning project for a new language.
• Would remove the python runtime dependency.
• Would give more room to write unit tests.

As the first step, would just rewrite the driver (bear/main.py.in). And only when that pass the test would rewrite the intercept library (libear/ear.c). The second step is blocked by this limitation of Rust.

[rizsotto]

rewrite is happening in C++. ;)